1ISNORMAL(P) POSIX Programmer's Manual ISNORMAL(P)
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6 isnormal - test for a normal value
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9 #include <math.h>
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11 int isnormal(real-floating x);
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15 The isnormal() macro shall determine whether its argument value is nor‐
16 mal (neither zero, subnormal, infinite, nor NaN). First, an argument
17 represented in a format wider than its semantic type is converted to
18 its semantic type. Then determination is based on the type of the argu‐
19 ment.
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22 The isnormal() macro shall return a non-zero value if and only if its
23 argument has a normal value.
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26 No errors are defined.
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28 The following sections are informative.
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31 None.
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34 None.
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37 None.
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40 None.
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43 fpclassify() , isfinite() , isinf() , isnan() , signbit() , the Base
44 Definitions volume of IEEE Std 1003.1-2001, <math.h>
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47 Portions of this text are reprinted and reproduced in electronic form
48 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
49 -- Portable Operating System Interface (POSIX), The Open Group Base
50 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
51 Electrical and Electronics Engineers, Inc and The Open Group. In the
52 event of any discrepancy between this version and the original IEEE and
53 The Open Group Standard, the original IEEE and The Open Group Standard
54 is the referee document. The original Standard can be obtained online
55 at http://www.opengroup.org/unix/online.html .
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59IEEE/The Open Group 2003 ISNORMAL(P)